Fri 2016-10-28 17:07:03 UTC+2, marech...@gmail.com:
>
> Hello,
>
> I have troubles plotting 3D polyhedra. I don't understand what happens 
> because I've done it for several years and it is the first time it does not 
> work.
>
> Small example : 
>
> # 2*x + y >= 0 ; -x - y + 2 - z >= 0 ; z >= 0 ; -x + 1 >= 0 ; -y + 2 >= 0
> ineqs = [[0,2,1,0], [2,-1,-1,-1], [0,0,0,1], [1,-1,0,0], [2,0,-1,0]]
>
> P = Polyhedron(ieqs = ineqs)
>
> to_plot = P.projection().render_solid_3d()
> to_plot.show()
>
> #to plot the outline of a 3D polyhedron 
> to_plot = P.projection().render_wireframe_3d(color = 'blue', alpha = 0.8)
> to_plot.show()
>
> By plotting the wireframe of P, everything works (see 
> wireframe_jmol_ok.png).
>
> But plotting the solid with render_solid_3d does not work (see 
> solid_jmol_ko.png).
>
> I asked some other people to run this test and they obtain the same result.
>
> Greetings,
> Alexandre
>

What is your OS and what version of Sage?
Did you recently upgrade your OS or your Sage installation?
How is Sage installed? (binaries for your OS, built from source?)
 

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